Sorry to hear that. A lot of trips go weird because people don't realise what a powerful chemical it is. The MIND unleashed is a scary place.
Tim Leary always advocated getting the 'set and setting' right ie. somewhere that is cool and groovey for you and where you can relax. Seclusion in nature with a nice fire I always found the best.
Must admit it's been a few years since I did it. Been trying to bridge the gap between here and there.....
Anyway producing music does it for me now (plus the odd complementary spliff).